If you want a fast cli and java, you'd have the java process running and feed the input/output where by some means. Overall Java is not a good fit for a classic CLI, at least not with the JIT - it works in a pinch of course but it's well known it has a slow bootstrap.

Of course I read the article, the benchmarks are at the end. The rest is about LoC (which is yet another benchmark, albeit even more useless). I even read all the code on github, there is a room for improvement there as well.

That’s such an extreme niche that unless specifically pointed out, it should not be given such attention.

But I do agree that the post is not a benchmark.